<template>
  <div class="cc-decoration-9 col" :ref="ref">
    <svg
      :width="`${svgWH[0]}px`"
      :height="`${svgWH[1]}px`"
      :style="`transform:scale(${svgScale[0]},${svgScale[1]});`"
    >
      <defs>
        <polygon :id="polygonId" points="15, 46.5, 21, 47.5, 21, 52.5, 15, 53.5" />
      </defs>

      <circle
        cx="50"
        cy="50"
        r="45"
        fill="transparent"
        :stroke="mergedColor[1]"
        stroke-width="10"
        stroke-dasharray="80 100 30 100"
      >
        <animateTransform
          attributeName="transform"
          type="rotate"
          values="0 50 50;360 50 50"
          :dur="`${dur}s`"
          repeatCount="indefinite"
        />
      </circle>

      <circle
        cx="50"
        cy="50"
        r="45"
        fill="transparent"
        :stroke="mergedColor[0]"
        stroke-width="6"
        stroke-dasharray="50 66 100 66"
      >
        <animateTransform
          attributeName="transform"
          type="rotate"
          values="0 50 50;-360 50 50"
          :dur="`${dur}s`"
          repeatCount="indefinite"
        />
      </circle>

      <circle
        cx="50"
        cy="50"
        r="38"
        fill="transparent"
        :stroke="fade(mergedColor[1] || defaultColor[1], 30)"
        stroke-width="1"
        stroke-dasharray="5 1"
      />

      <use
        v-for="(foo, i) in new Array(20).fill(0)"
        :key="i"
        :xlink:href="`#${polygonId}`"
        :stroke="mergedColor[1]"
        :fill="Math.random() > 0.4 ? 'transparent' : mergedColor[0]"
      >
        <animateTransform
          attributeName="transform"
          type="rotate"
          values="0 50 50;360 50 50"
          :dur="`${dur}s`"
          :begin="`${i * dur / 20}s`"
          repeatCount="indefinite"
        />
      </use>

      <circle
        cx="50"
        cy="50"
        r="26"
        fill="transparent"
        :stroke="fade(mergedColor[1] || defaultColor[1], 30)"
        stroke-width="1"
        stroke-dasharray="5 1"
      />
    </svg>

    <slot></slot>
  </div>
</template>

<script>
import { DecorationMixin } from 'boot/mixins/decoration';
import { uid } from 'quasar';
import { fade } from 'components/utils/color';

export default {
  mixins: [DecorationMixin],
  name: 'CcDecoration9',
  props: {
    dur: {
      type: Number,
      default: 3,
    },
  },
  data() {
    const id = uid();
    return {
      ref: 'decoration-9',

      polygonId: `decoration-9-polygon-${id}`,

      svgWH: [100, 100],

      svgScale: [1, 1],

      defaultColor: ['rgba(3, 166, 224, 0.8)', 'rgba(3, 166, 224, 0.5)'],

      mergedColor: [],
    };
  },
  methods: {
    afterAutoResizeMixinInit() {
      const { calcScale } = this;

      calcScale();
    },
    calcScale() {
      const { width, height, svgWH } = this;

      const [w, h] = svgWH;

      this.svgScale = [width / w, height / h];
    },
    onResize() {
      const { calcScale } = this;

      calcScale();
    },
    fade,
  },
};
</script>

<style lang="stylus">
.cc-decoration-9
  position relative
  display flex
  align-items center
  justify-content center
  svg
    position absolute
    left 0px
    top 0px
    transform-origin left top
</style>
